New Delhi: Early delivery of Samsung's new flagship Galaxy S8 and S8+ for pre-booking customers will start from Tuesday and owing to high demand of the black colour variants, the delivery date of these devices will start from May 12.

The pre-orders for its new flagship Galaxy S8 and S8+ devices have reached 80,000 units within a week of the launch in India.

"The pre-orders are expected to hit 150,000 units by the end of this month," industry sources told IANS.

Packed with a voice assistant, the 5.8-inch Galaxy S8 and 6.2-inch Galaxy S8+ were listed on a Flipkart banner ad for pre-orders, starting from April 19.

The pre-booking saw more than four times the pre-booking compared to the earlier Galaxy S7 and S7 Edge devices.

Set to give Apple iPhones a tough competition, Samsung released the devices with a voice assistant called Bixby.

At Rs 57,900 and Rs 64,900, respectively, the S8 and S8+ devices with significantly larger screens, have re-engineered design with rounded edges and symmetrical sides make them compact and comfortable for one-handed operation.

The "Infinity Display" and bezel-less design gives a user 18 percent more screen with no buttons. The physical home key on the front has given way to a more intuitive soft key with a pressure sensor that is embedded under the display.

For security, the company introduced an iris scanner, which is one of the most secure biometric identification systems on a phone.

Samsung S8 and S8+ have 12MP rear cameras with multi-frame processing and optical image stabilisation and 8MP auto-focus front shooters. The devices run on Android 7.0 Nougat. While S8 has a 3,000 mAh battery, S8+ boasts a 3,500 mAh battery.